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Indicates whether or not the document is a synthetic one; that is, a document representing a standalone image, video, audio, or the like.
Syntax
var isSynthetic = document.mozSyntheticDocument;
On return, isSynthetic is true if the document is a synthetic one; otherwise it's false.
Example
This can be useful if you have a contextual menu item you only want to display for synthetic documents (or, conversely, for documents that aren't synthetic).
var isSynthetic = document.mozSyntheticDocument;
if (isSynthetic) {
/* insert your menu item here */
}
Specifications
Not part of any specification.